I'd like to have a talk with this girl but not sure how to go about it?

i meet her last year so known her for a while now and have talked to her before i'd just like to have a bit more in depth conversation with her and try and get a better feel for what she wants. and is some issues i'd like to clear up and things i'd like to talk to her about as this summer there has been some issues and is a girl we both are friends with that has caused some issues and seems to have annoyed her. but only time i see her is at her work a restaurant and at this bar we go to but its always busy/loud. and she seems to have other things to do.